Cable extension for reducing EMI emissions
First Claim
Patent Images
1. An apparatus for reducing cable emissions comprising:
- a conductive cable core that extends longitudinally from a first end to a second end;
a filter coupled to and encasing the conductive cable core, the filter extending longitudinally only a portion of the conductive cable core length and positioned between the first end and the second end; and
a cable shield coupled to and encasing the conductive cable core and the filter, the cable shield extending longitudinally from the first end over the filter and terminating prior to the second end.
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Abstract
A cable emission reduction apparatus comprises a conductive cable core, a filter, and a cable shield. The conductive cable core extends longitudinally from a first end to a second end. The filter is coupled to and encases the conductive cable core, and extends longitudinally only a portion of the conductive cable core length, positioned between the first end and the second end. The cable shield is coupled to and encases the conductive cable core and the filter. The cable shield extends longitudinally from the first end over the filter and terminating prior to the second end.
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Citations
20 Claims
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1. An apparatus for reducing cable emissions comprising:
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a conductive cable core that extends longitudinally from a first end to a second end;
a filter coupled to and encasing the conductive cable core, the filter extending longitudinally only a portion of the conductive cable core length and positioned between the first end and the second end; and
a cable shield coupled to and encasing the conductive cable core and the filter, the cable shield extending longitudinally from the first end over the filter and terminating prior to the second end. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A cable extension comprising:
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a partially shielded cable comprising interior conductive elements and cable shielding overlying the interior conductive elements, the partially shielded cable extending longitudinally from a proximal end to a distal end, the cable shielding beginning at the proximal end and extending only part of the longitudinal cable length;
a ferrite filter coupled between the interior conductive elements and the cable shielding and longitudinally positioned between the proximal end and the distal end;
a shielded connector coupled to the proximal end and having a connector shield electrically coupled to the cable shielding; and
a second connector coupled to the distal end and electrically isolated from the cable shield. - View Dependent Claims (10, 11, 12, 13, 14)
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15. A method of manufacturing a cable extension comprising:
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coupling a ferrite filter to an unshielded portion of a cable that is partially or completely unshielded, the cable extending longitudinally from a proximal end to a distal end, the ferrite filter being coupled at a selected position between the proximal end and the distal end;
encasing at least the ferrite filter in a cable shield, the cable shield combining with any shielding of the cable to form a substantially continuous cable shielding from the proximal end, overlying the ferrite filter to a position prior to the distal end;
coupling a shielded connector to the proximal end of the cable;
coupling a shield of the shielded connector to the cable shield at the proximal end; and
coupling a second connector to the distal end of the cable, the second connector being left electrically uncoupled to the cable shield. - View Dependent Claims (16, 17, 18, 19)
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20. A cable extension comprising:
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a cable extending longitudinally from a proximal end to a distal end and comprising a plurality of interior conductive elements;
means coupled to the interior conductive elements and positioned at a selected location along the cable for increasing common mode impedance of a noise signal;
means overlying the common mode impedance increasing means the cable and extending from the proximal end to a position prior to the distal end for containing the noise signal;
means electrically coupled to the containing means for coupling the cable proximal end in proximity to a communication device; and
means coupled to the cable distal end for coupling to a communication line.
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Specification